About this tool
Compute pace (time per unit distance) and average speed from a measured run. Works in either kilometers or miles.
Formula
pacePerKm = totalSeconds / distanceKm. speedKmh = distanceKm / (totalSec/3600).
Worked example
5 km in 25:00 → 5:00 /km, 12.0 km/h, 8:03 /mi, 7.46 mph.
Notes
For marathons (42.195 km / 26.2 mi), 5:00 /km ≈ 3:31 finish; 4:00 /km ≈ 2:49 finish.